Improvement in fire-proof floors



UNITED FFE@ JAMEs DUNsErrH, 0E NEW YORK, N. Y.'

IMPROVEMENT IN FIRE-PROOF FLOORS.

To all whom it may concern:

Beit known that I, JAMES DUNsEI'rH, of the city, county, and State of New York, have invented a new and Improved Fire-Proof Floor; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification.

This invention relates to improvements in the construction of fire-proof floors; and it consists in the hereinafter-described arrangement oi' l'lat and curved sheet-metal bars or strips for the support of a top of concrete and a Wood or tile covering, all substantially as specified.

Figure l is an end elevation of the improved arrangement of metal bars and strips, and Fig. 2 is a section on the line w x of Fig. l.

Similar letters of reference indicate corresponding parts.

A represents long flat bars of thin sheet metal, with a perpendicular iian ge, B, turned on each edge. G represents other long thin bars, which. are curved or arched, and riveted at or near theirI edges to the strips A, Which are placed edgewise vertically, one between each tivo, the connection being so arranged that the tops ofthe arches do not rise quite as high as the tops of the bars A. The bars A have narrower strips D arranged across and riveted to the lower flanges B at suitable intervals apart, to serve as laths for holding the ceiling plastering to be applied to them, as Well as to brace them laterally. Other similar strips J are arranged across and riveted to the upper ilanges, or Wood pieces E may be bolted lon to receive and support the door-board, shown dotted at F. The outside flanges B11 will be built into and rest in the Wall, the face of which is indicated by the dotted line G. Other iianges B2 may be applied to the outside strips A above B1, for letting into the Wall. The ends ofthe strips B and C will be let into the Wall perpendicular to Wall G, or the strips B only may rest on the top or on beams. For aiioor of great length the bars A may be lapped and riveted at H, and, if preferred, the bars C may be lapped also. The Width may be regulated by the number of bars A and C connected together. Diagonal braces K may be employed if preferred. Of course the width ofthe bars A and C may be varied to suit the circumstances of the ease, but for ordinary oors I propose to make them from about ten to fourteen inches, and believe that with bars of this Width stronger floors can be made with a given Weight of material than can be made by any other arrangement. I may sometimes prefer to brace the arched plates by angle-Wire bars X bent over and riveted to them.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The combination ofthe iianged iiat bars A, arched bars C, narrow transverse strips D and J, or Wood pieces E, all arranged substantially as specified.

JAMES DUNSEITH.

l/Vitnesses GEO. W. MABEE, T. B. MosrIEE. 

